Background: The study aimed to determine the proportion of each priority level of patients, time of performance in each priority level, and the reliability of the South African Triage Scale (SATS) tool at the Mahalapye District Hospital - Emergency Department (MDH-ED), a setting where the majority of the nurses were not formally trained on the use of the SATS. Methods: This was a cross-sectional study using case records in MDH-ED from 1 January 2014 to 31 December 2014. A panel of experts from the Mahalapye site of the Family Medicine Department, University of Botswana, reviewed and scored each selected case record that was compared with the scores previously attributed to the nurse triage. Results: From the 315 case records, both the nurse triage and the panel of expert triage assigned the majority of cases in the routine category (green), 146 (46%) and 125 (40%), respectively, or in the urgent category (yellow), they assigned 140 (44%) and 111 (35%) cases, respectively.Overall, there was an adequate agreement between the nurse triage and the panel of expert triage (k = 0.4, 95% confidence interval: 0.3–0.5), although the level of agreement was satisfactory. Conclusion: Findings of the study reported that the profile of the priority-level categories in MDH-ED was made in the majority of routine and urgent patients, only the routine and the emergency patients were seen within the targeted time and they had a satisfactory level of reliability (between 0.4 and 0.6).